Fiction by Sarah Waters.
I recently read Fingersmith by this author and LOVED it, but this book was kind of disappointing.
It's basically--ahem--a lesbian romance set in 1920's England, which was not exactly what I was expecting. In general, I prefer romance (of any kind) to be secondary to plot in a novel. The story finally picked up a bit more than halfway through the book, but there was a lot of nothing going on but luv-luv-luv for way too long. And maybe I'm being a prude about it, of course.